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Leland:
Normally this is true, but if your engine is already at "normal operating" temperature, then oil to the the top hash mark will not expand much more (unless you keep getting hotter and hotter, as on the track or under some other load), and therefore will not over-expand into your air box.
By the way, notice that as you accelerate, your oil tank gauge goes down, indicating that the pumps are doing their job in scavenging from the sump and the tank, and keeping all that nice oil flowing as it was designed.
And since I don't sit idling too much (more fun to drive it), an overexpanding oil capacity is never a problem.......Andras
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